After a soldier is converted into a MEC he/she will wear a metal endoskeleton called Base Augments as its body Instead of armor, MEC Troopers use the Mechanized Exoskeleton Cybersuit into battle. It is not possible to deploy a MEC Trooper without a suit.

MEC Suits are built in Engineering. There are 3 tiers of MEC Suits which can be customized, each unlocks a choice between two new tactical subsystems, allowing for 8 different builds of MEC Suits. The first suit, MEC-1, can be built immediately after the first soldier is augmented on the Cybernetic Lab but the next suits require further research in order to be developed. If a MEC Trooper is killed the MEC Suit will become damaged and will have to be repaired on Engineering.

MEC Suits came with the Minigun as its default Primary Weapon: more advanced primary weapons need to be manufactured in Engineering before being deployed.
There are 3 tiers of MEC Suits which can be customized, each unlocks a choice between two new tactical subsystems, allowing for 8 different builds of MEC Suits: